Some have reported that Win8 was the issue for them and they could only get it to work with Win7. Do you have access to a Win7 based machine? I had no issues with my rooting using this method, but I have a Win7 laptop.
I have to ask but you do have USB Debugging on, right? Sometimes it's something obvious like this that gets overlooked.
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Yep, unknown sources and debugging is definitely on. I'm on vacation right now but when I get home I'll try on a win7 machine.
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